If you are a collector of unique and distinctive Tolkien memorabilia, including signed letters and first editions, you'll want to pay attention to Bonham's of London auction taking place on March 19th 2013. The four lots available are:

Book - TOLKIEN (J.R.R.) The Hobbit or There and Back Again... Illustrated by the Author, FIRST EDITION, second impression, dust-jacket, 1937 [Auction]

Letter - LEWIS (C.S.) Autograph letter signed ("C.S. Lewis"), to Father Dominic, concerning the success of 'Lord of the Rings' [Auction]